package org.apache.maven.repository.metadata;

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *  http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

import org.apache.maven.artifact.ArtifactScopeEnum;

/**
 * classpath container that is aware of the classpath scope
 *
 * @author <a href="oleg@codehaus.org">Oleg Gusakov</a>
 *
 */
public class ClasspathContainer implements Iterable<ArtifactMetadata> {
  private List<ArtifactMetadata> classpath;

  private ArtifactScopeEnum scope;

  // -------------------------------------------------------------------------------------------
  public ClasspathContainer(ArtifactScopeEnum scope) {
    this.scope = ArtifactScopeEnum.checkScope(scope);
  }

  // -------------------------------------------------------------------------------------------
  public ClasspathContainer(List<ArtifactMetadata> classpath, ArtifactScopeEnum scope) {
    this(scope);
    this.classpath = classpath;
  }

  // -------------------------------------------------------------------------------------------
  public Iterator<ArtifactMetadata> iterator() {
    return classpath == null ? null : classpath.iterator();
  }

  // -------------------------------------------------------------------------------------------
  public ClasspathContainer add(ArtifactMetadata md) {
    if (classpath == null) {
      classpath = new ArrayList<ArtifactMetadata>(16);
    }

    classpath.add(md);

    return this;
  }

  // -------------------------------------------------------------------------------------------
  public List<ArtifactMetadata> getClasspath() {
    return classpath;
  }

  // -------------------------------------------------------------------------------------------
  public MetadataTreeNode getClasspathAsTree() throws MetadataResolutionException {
    if (classpath == null || classpath.size() < 1) {
      return null;
    }

    MetadataTreeNode tree = null;
    MetadataTreeNode parent = null;
    MetadataTreeNode node = null;

    for (ArtifactMetadata md : classpath) {
      node = new MetadataTreeNode(md, parent, md.isResolved(), md.getArtifactScope());
      if (tree == null) {
        tree = node;
      }

      if (parent != null) {
        parent.setNChildren(1);
        parent.addChild(0, node);
      }

      parent = node;

    }
    return tree;
  }

  public void setClasspath(List<ArtifactMetadata> classpath) {
    this.classpath = classpath;
  }

  public ArtifactScopeEnum getScope() {
    return scope;
  }

  public void setScope(ArtifactScopeEnum scope) {
    this.scope = scope;
  }

  // -------------------------------------------------------------------------------------------
  @Override
  public String toString() {
    StringBuilder sb = new StringBuilder(256);
    sb.append("[scope=" + scope.getScope());
    if (classpath != null) {
      for (ArtifactMetadata md : classpath) {
        sb.append(": " + md.toString() + '{' + md.getArtifactUri() + '}');
      }
    }
    sb.append(']');
    return sb.toString();
  }
  // -------------------------------------------------------------------------------------------
  // -------------------------------------------------------------------------------------------
}
